If F is 400 N and S=2m^2, find the pressure(P) ? (Doh)(Speechless)

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- Jul 25th 2009, 01:16 AMalternativePlease help solving this physics problem
If F is 400 N and S=2m^2, find the pressure(P) ? (Doh)(Speechless)

- Jul 25th 2009, 01:38 AMsongoku
P = F/A

In this case, A = S = area - Jul 25th 2009, 02:00 AMjashansinghal
what does S mean,displacement?

- Jul 25th 2009, 02:03 AMsongoku
From the unit given, it's area

- Jul 25th 2009, 02:07 AMe^(i*pi)
S cannot be displacement because it has dimensions of (Length)^2 whereas displacement has dimensions of (Length). This means that S is an area of some kind although it is more usual to use

**A**to denote an area

$\displaystyle P = \frac{F}{A}cos \alpha$ where $\displaystyle \alpha$ is the angle between the force and the vertical and will be measured in $\displaystyle Pa$ or $\displaystyle Nm^{-2}$

In your example it's probably a perpendicular force so $\displaystyle cos \alpha = 1$ and it reduces to $\displaystyle P=\frac{F}{A}$